PDFlib Cookbook

cookbook

graphics/layers_and_bookmarks

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/* $Id: layers_and_bookmarks.java,v 1.4 2013/01/15 10:11:59 stm Exp $
 * Layers and bookmarks:
 * Define two layers and hide or show them via bookmarks 
 * 
 * Define two layers for English or German text. Create two bookmarks which
 * show the English or the German layer, respectively.
 * 
 * Required software: PDFlib/PDFlib+PDI/PPS 9
 * Required data: none
 */
package com.pdflib.cookbook.pdflib.graphics;

import com.pdflib.pdflib;
import com.pdflib.PDFlibException;

public class layers_and_bookmarks
{
    public static void main (String argv[])
    {
    /* This is where the data files are. Adjust as necessary. */
    String searchpath = "../input";
    String outfile = "layers_and_bookmarks.pdf";
    String title = "Layers and Bookmarks";

    pdflib p = null;
    int font, action, layerEN, layerDE;

    try {
        p = new pdflib();

        p.set_option("searchpath={" + searchpath + "}");

        /* This means we must check return values of load_font() etc. */
        p.set_option("errorpolicy=return");
        
        /* Open the document with the "Bookmarks" navigation tab visible */
        if (p.begin_document(outfile, "openmode=bookmarks") == -1)
            throw new Exception("Error: " + p.get_errmsg());

        p.set_info("Creator", "PDFlib Cookbook");
        p.set_info("Title", title + " $Revision: 1.4 $");
        
        /* Load the font */
        font = p.load_font("Helvetica-Bold", "unicode", "");
        if (font == -1) {
            throw new Exception("Error: " + p.get_errmsg());	
        }
        
        /* Start page */
        p.begin_page_ext(0, 0, "width=a4.width height=a4.height");
        
        /* Define the layer "English" and place some English text on it */
        layerEN = p.define_layer("English", "");
        p.begin_layer(layerEN);
        p.fit_textline("Our paper planes are the ideal way of passing the " +
            "time.", 30, 600, "font=" + font + " fontsize=20");
               
        /* Define the layer "German" which is hidden when opening the document
         * or printing it. Place a German image caption on that layer.
         */
        layerDE = p.define_layer("German", "initialviewstate=false " +
            "initialprintstate=false");
        p.begin_layer(layerDE);
        p.fit_textline("Unsere Papierflieger sind ein idealer Zeitvertreib.",
            30, 600, "font=" + font + " fontsize=20");
             
        /* At most one of the "English" and "German" layers should be visible */
        p.set_layer_dependency("Radiobtn", "group={" + layerEN + " " +
            layerDE + "}");
        
        /* Create a "SetOCGState" action which shows the English layer. Since
         * at most one layer may be visible we don't need to explicitly hide
         * the German layer.
         */
        action = p.create_action("SetOCGState", "layerstate={on " +
            layerEN + "}");
    
        /* Create a bookmark which activate the action above to shows the layer
         * with the English text
         */
        p.create_bookmark("Show English", " action={activate=" + action + "}");
        
        /* Create a "SetOCGState" action which shows the German layer. Since
         * at most one layer may be visible we don't need to explicitly hide
         * the English layer. */
        action = p.create_action("SetOCGState", "layerstate={on " +
            layerDE + "}");
    
        /* Create a bookmark which activate the action above to shows the layer
         * with the German text
         */
        p.create_bookmark("Show German", " action={activate=" + action + "}");
        
        /* Complete all layers */
        p.end_layer();
       
        p.end_page_ext("");
                
        p.end_document("");

        } catch (PDFlibException e) {
            System.err.print("PDFlib exception occurred:\n");
            System.err.print("[" + e.get_errnum() + "] " + e.get_apiname() +
                ": " + e.get_errmsg() + "\n");
        } catch (Exception e) {
            System.err.println(e.getMessage());
        } finally {
            if (p != null) {
                p.delete();
            }
        }
    }
}